# US 2019/0174470 A1 · Wireless Communication Control Channel Apparatus and Method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0174470 A1 - Document ID: US20190174470A1 - Status: Published application - Kind: A1 - Application number: 16/267,044 - Filed: 2019-02-04 - Published: 2019-06-06 - Earliest claimed: 2011-09-29 - Assignees: Futurewei Technologies, Inc. - Applicants: Futurewei Technologies, Inc. - Inventors: Bingyu QU; Philippe SARTORI - Web page: https://patentgrep.com/patent/US20190174470A1 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/0016: {Time-frequency-code} - H04L 5/0023: {Time-frequency-space} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 25/0202: {Channel estimation} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/53: based on regulatory allocation policies - H04L 25/0226: {sounding signals per se} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract An apparatus and method for control channel transmission in a wireless network are disclosed. A disclosure is provided with at least one resource block (RB) including a first control channel element associated with a first antenna port (AP) and a second control channel element associated with a second AP. The first and second control channel elements might be used for transmission of a single control channel, and a first reference signal sequence associated with one of the first AP and the second AP is selected for transmission of the single control channel based on a control channel element index value, such that a resource element of the at least one RB can be detected to decode the first control channel element and the second control channel element. ## Claims ### Claim 1 A method for decoding, comprising: receiving, through a wireless communication, a first control channel element associated with a control channel element index value receiving, through a wireless communication, a second control channel element associated with a second control channel element index value; selecting a first reference signal sequence associated with at least one antenna port (AP) for reception of a single control channel based on the lowest control channel index value of the first control channel element index value of the first control channel element and the second control channel element index value of the second control channel element; and detecting a resource element of at least one resource block (RB) using the first reference signal sequence to decode the first control channel element and the second control channel element. ### Claim 2 (depends on 1) The method of claim 1, wherein the single control channel is an enhanced Physical Downlink Control Channel (E-PDCCH) of a long term evolution (LTE) sub-frame, and wherein the first control channel element and the second control channel element are enhanced control channel elements (eCCEs) of the E-PDCCH. ### Claim 3 (depends on 2) The method of claim 2, further comprising: in response to the selection, detecting the resource element of the at least one RB without using a second reference signal sequence associated with a second AP to decode the first control channel element and the second control channel element. ### Claim 4 (depends on 3) The method of claim 3, further comprising: in response to a determination that the first control channel element and the second control channel element are used for transmission of different control channels, detecting the resource element of the at least one RB using both the first reference signal sequence and the second reference signal sequence to decode the first control channel element and the second control channel element, respectively. ### Claim 5 (depends on 2) The method of claim 2, wherein the step of detect a resource element of the at least one RB using the first reference signal sequence comprises: performing channel estimation for both the first control channel element and the second control channel element using the first reference signal sequence. ### Claim 6 A user equipment (UE), comprising: a processor; and a memory comprising instructions for the processor to: obtain a first control channel element associated with a first control channel element index value; obtain a second control channel element associated with a second control channel element index value; select a first reference signal sequence associated a first antenna port (AP) for reception of a control channel based on the lowest control channel index value of a first control channel element index value of the first control channel element and a second control channel element index value of the second control channel element; and detect a resource element of the at least one RB using the first reference signal sequence to decode the first control channel element and the second control channel element. ### Claim 7 (depends on 6) The UE of claim 6, wherein the control channel is an enhanced Physical Downlink Control Channel (E-PDCCH) of a long term evolution (LTE) sub-frame, and wherein the first control channel element and the second control channel element are enhanced control channel elements (eCCEs) of the E-PDCCH. ### Claim 8 (depends on 7) The UE of claim 7, wherein the instructions to detect the resource element of the at least one RB comprises: instruction to detect the resource element of the at least one RB without using a second reference signal sequence associated with a second AP to decode the first control channel element and the second control channel element. ### Claim 9 (depends on 8) The UE of claim 8, wherein the program further includes instructions to: in response to a determination that the first control channel element and the second control channel element are used for transmission of different control channels, detect the resource element of the at least one RB using both the first reference signal sequence and the second reference signal sequence to decode the first control channel element and the second control channel element, respectively. ### Claim 10 (depends on 7) The method of claim 7, wherein the instructions to detect a resource element of the at least one RB using the first reference signal sequence comprise: instructions to perform channel estimation for both the first control channel element and the second control channel element using the first reference signal sequence.